21033454 has 32 divisors (see below), whose sum is σ = 37558080. Its totient is φ = 8735232.

The previous prime is 21033443. The next prime is 21033461. The reversal of 21033454 is 45433012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9132 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (1173690).

Almost surely, 2^21033454 is an apocalyptic number.

21033454 is a deficient number, since it is larger than the sum of its proper divisors (16524626).

21033454 is a wasteful number, since it uses less digits than its factorization.

21033454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21033454 is about 4586.2243730546. The cubic root of 21033454 is about 276.0388431643.

Adding to 21033454 its reverse (45433012), we get a palindrome (66466466).

The spelling of 21033454 in words is "twenty-one million, thirty-three thousand, four hundred fifty-four".